Rust

Unzip a ZIP Entry Directly into a BinData Object Using ZipEntry.UnzipToBd

See more Zip Examples

This example demonstrates how to use the ZipEntry.UnzipToBd method to inflate a ZIP entry directly into a BinData object.

The entry contents are uncompressed entirely in memory without creating a file on disk.

This is useful when:

• Processing ZIP entry data entirely in memory
• Avoiding temporary filesystem files
• Working with binary files such as images, PDFs, or certificates
• Passing uncompressed ZIP data directly to other APIs

The example opens a ZIP archive, locates a PDF entry, inflates it into a BinData object, and then writes the uncompressed bytes to a new file.

Suppose the ZIP archive contains:

docs/report.pdf

The entry is uncompressed directly into memory before optionally being saved to:

qa_output/report.pdf

Rust

let zip = chilkat::Zip::new();

// Open an existing ZIP archive.
if zip.open_zip("qa_data/zips/documents.zip").is_err() {
    println!("{}", zip.last_error_text());
    return;
}

// Locate the PDF entry within the ZIP archive.
let entry = chilkat::ZipEntry::new();

if zip.entry_of("docs/report.pdf", &entry).is_err() {
    println!("ZIP entry not found.");
    zip.close_zip();
    return;
}

// ------------------------------------------------------------
// Inflate the ZIP entry directly into a BinData object.
// 
// The uncompressed bytes are stored entirely in memory.
// 
let pdf_data = chilkat::BinData::new();

if entry.unzip_to_bd(&pdf_data).is_err() {
    println!("{}", entry.last_error_text());
    return;
}

println!("Uncompressed size = {}", pdf_data.num_bytes());
println!("");

// ------------------------------------------------------------
// Optionally save the uncompressed bytes to a file.
// 
if pdf_data.write_file("qa_output/report.pdf").is_err() {
    println!("{}", pdf_data.last_error_text());
    return;
}

zip.close_zip();

println!("PDF extracted successfully.");